io.c: recurse for the argument

* io.c (rb_io_puts): recurse for the argument itself, not converted
  array elements.  [ruby-core:42444] [Bug #5986]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38120 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index d0924844b1..d509a9bfe2 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2583,5 +2583,17 @@ End
       end
     end
   end
+
+  def test_puts_recursive_ary
+    bug5986 = '[ruby-core:42444]'
+    c = Class.new {
+      def to_ary
+        [self]
+      end
+    }
+    s = StringIO.new
+    s.puts(c.new)
+    assert_equal("[...]\n", s.string, bug5986)
+  end
 end